cryptix.provider.cipher
public final class SPEED extends Cipher implements SymmetricCipher
These parameters are set as follows:
initEncrypt
or initDecrypt
. It can be
any even number of bytes from 6 to 32 (6, 8, 10, ... 32).
These are recommended settings for 'adequate' security:
+--------------------------------------------------+ | block size | key length | rounds | |==================================================| | 8 | >= 8 | >= 64 | |--------------------------------------------------| | 16 | >= 8 | >= 48 | |--------------------------------------------------| | 32 | >= 8 | >= 48 | +--------------------------------------------------+
SPEED was designed by Yuliang Zheng, and is in the public domain.
References:
Copyright © 1997
Systemics Ltd on behalf of the
Cryptix Development Team.
All rights reserved.
$Revision: 1.6 $
Since: Cryptix 2.2.2
Constructor Summary | |
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SPEED()
Constructs a SPEED cipher object, in the UNINITIALIZED state.
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Method Summary | |
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protected void | blockDecrypt(byte[] in, int in_offset, byte[] out, int out_offset)
Decrypts a block. |
protected void | blockEncrypt(byte[] in, int in_offset, byte[] out, int out_offset)
Encrypts a block. |
Object | clone()
Always throws a CloneNotSupportedException (cloning of ciphers is not
supported for security reasons). |
void | dump() |
protected int | engineBlockSize()
SPI: Return the data block length of this cipher.
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protected Object | engineGetParameter(String param)
SPI: Gets the value of the specified algorithm parameter.
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void | engineInitDecrypt(Key key)
SPI: Initializes this cipher for decryption, using the
specified key.
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void | engineInitEncrypt(Key key)
SPI: Initializes this cipher for encryption, using the
specified key.
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protected void | engineSetParameter(String param, Object value)
SPI: Sets the specified algorithm parameter to the specified
value.
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protected int | engineUpdate(byte[] in, int inOffset, int inLen, byte[] out, int outOffset)
SPI: This is the main engine method for updating data.
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protected void | finalize()
Cleans up resources used by this instance, if necessary. |
static LinkStatus | getLinkStatus()
Gets an object representing the native linking status of this class. |
int | getRounds()
Returns the currently set number of rounds for this instance.
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static void | main(String[] argv)
Entry point for self_test. |
static void | self_test(PrintWriter out, String[] argv)
Runs algorithm through test data, including certification data
provided in paper. |
void | setBlockSize(int blocksize)
Sets the block size in bytes for this cipher. |
void | setRounds(int rounds)
Sets the number of rounds for this cipher. |
Parameters: in The data to be decrypted. in_offset The start of data within the in buffer. out The decrypted data. out_offset The start of data within the out buffer.
Parameters: in The data to be encrypted. in_offset The start of data within the in buffer. out The encrypted data. out_offset The start of data within the out buffer.
Returns: the block length in bytes.
SPEED has two parameters:
Parameters: param the string name of the parameter.
Returns: the object that represents the parameter value, or null if there is none.
Parameters: key the key to use for decryption.
Throws: InvalidKeyException if one of the following occurs:
Parameters: key the key to use for encryption.
Throws: InvalidKeyException if one of the following occurs:
SPEED has two parameters:
Parameters: param the string name of the parameter. value the parameter value.
Throws: InvalidParameterException if param is an invalid parameter for this cipher implementation, the parameter is already set and cannot be set again, a security exception occurs, and so on. InvalidParameterTypeException if value is of the wrong type.
in and out may be the same array, and the input and output regions may overlap.
Parameters: in the input data. inOffset the offset into in specifying where the data starts. inLen the length of the subarray. out the output array. outOffset the offset indicating where to start writing into the out array.
Returns: the number of bytes written.
Throws: CryptixException if the native library is being used, and it reports an error.
Returns: the number of rounds.
If the specified number is invalid, an IllegalArgumentException is thrown.
Parameters: blocksize the desired block size in bytes: 8, 16 or 32
Throws: IllegalStateException if this cipher is not uninitialised. IllegalArgumentException if the given number of rounds is not supported.
If the specified number is invalid, an IllegalArgumentException is thrown.
Parameters: rounds the desired number of rounds: >= 32, multiple of 4
Throws: IllegalStateException if this cipher is not uninitialised. InvalidParameterException if the given number of rounds is not supported.